Wolf Tooth Components Rear Replacement Thru-Axle 1.0x167mm - BlackReplacement rear axles that are lightweight, easy to use and look great Button sliders are anodized caps for the non drive side that stick out to prevent frame damage when laying the bike over. Available in several anodized colors Trainer buttons attach to both ends of axle to allow fitment in trainers built around traditional QR end caps Uses a captive steel washer under the head to reduce friction on the frame, transferring more of the tightening